參數(shù)資料
型號： AN1500A
廠商： SAMES
英文描述： SINGLE CHIP TELEPHONE DEMO BOARD
中文描述： 單芯片電話演示板
文件頁數(shù)： 19/27頁
文件大小： 623K
代理商： AN1500A
AN1500A
sames
19/27
16.6 Current Limiting
Fig. 9 : Example of current limiting circuit
Principle: the line current generates a voltage drop across R6. If this voltage drop is >0.7V the Q6 switches on
effectively shutting off Q9. The 2W resistor R4 is used to dissipate the power generated as a result of the current
through and voltage across C-E of Q9.
I
shutoff
= 0.7V / R6
16.7 Overvoltage protection of the PCB:
Additionally to the protection measures described in pt. 16.4 and 16.5 it is highly advised to install an additional
surge protection device directly at the a- and b- terminals.
The maximum C-E breakdown voltages of the line and driver transistors are:
transistor type (line)
BSS 92,BSP92
MPS-A 92
2 SA 1209
2 SA 1210
V
CEO
,V
(BR)DSS
transistor type (driver)
MPS-A42, KSP42
MPS-A43,KSP43
2N5551
V
CEO
300V
200V
160V
200V
300V
160V
200V
The clamping voltage of a 150V-varistor can be up to 400V at 5 Amp. clamping current. In other words, it may not
be able to protect the line transistor at very high surge spikes.
10V
C
1
Q
M
Q
Q
Q
Q
Q
B
Q
M
Q3
QMPSA43
R
1
R
8
R
1
R
2
R3
15k
R10
1000k
R
1
R
2
R
3
T
TP2
T
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